Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-744, South Korea.
Department of Organic Materials and Fiber Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 156-743, South Korea.
J Environ Manage. 2018 Oct 1;223:652-657. doi: 10.1016/j.jenvman.2018.05.069. Epub 2018 Jun 30.
We used a nanofiltration (NF) membrane process to produce purified aqueous sulfuric acid from copper-refining sulfuric acid wastewater. Wastewater generated from a copper-refining process was used to explore the membrane performances and acid stabilities of six commercial NF membranes. A combination of permeate flux, sulfate permeation, and metal ion rejection clearly showed that two polyamide membranes and a polyacrylonitrile-based membrane achieved recovery of a purified sulfuric acid solution. Acid-stability and long-term performance tests showed that the polyamide membranes were unsuitable for copper-refining wastewater treatment because of their low acid stabilities. In contrast, the polyacrylonitrile-based composite membrane showed excellent acid stability, and gave greater than 90% metal ion rejection, with the exception of calcium ions, for 430 d. We also evaluated the recovery performance in 1 ton/d pilot-scale process using wastewater from copper-refining process; 90% metal ion rejection was achieved, with the exception of calcium ions, even at 95% recovery rate.
我们使用纳滤（NF）膜工艺从铜精炼硫酸废水中生产纯净的硫酸水溶液。利用铜精炼过程产生的废水来探索六种商业 NF 膜的膜性能和酸稳定性。透过通量、硫酸盐透过率和金属离子截留率的综合结果表明，两种聚酰胺膜和一种基于聚丙烯腈的膜实现了纯净硫酸溶液的回收。酸稳定性和长期性能测试表明，由于聚酰胺膜的酸稳定性较低，不适合用于铜精炼废水处理。相比之下，基于聚丙烯腈的复合膜表现出优异的酸稳定性，在 430 天内，除钙离子外，对金属离子的截留率大于 90%。我们还在使用铜精炼废水的 1 吨/天中试规模过程中评估了回收性能；即使在 95%的回收率下，除钙离子外，仍实现了 90%的金属离子截留率。
